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Simplex Trading

Simplex Trading Portfolio holdings

AUM $171B
1-Year Est. Return 85%
 

Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.

This Fund
S&P 500
This Quarter Est. Return
+18.73%
1 Year Est. Return
+85%
3 Year Est. Return
+183.25%
5 Year Est. Return
+145.21%
10 Year Est. Return
+1,056.84%
AUM
$55.7B
AUM Growth
-$21.5B
Cap. Flow
+$185M
Cap. Flow %
0.33%
Top 10 Hldgs %
43.23%
Holding
10,706
New
2,255
Increased
3,360
Reduced
3,150
Closed
1,707

Top Buys

Rank Stock Value
1
IWM icon
iShares Russell 2000 ETF
IWM
+$67.5M
2
PLTR icon
Palantir
PLTR
+$64.7M
3
PARA
Paramount Global Class B
PARA
+$31.5M
4
DIA icon
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
+$30.7M
5
CCL icon
Carnival Corporation Ltd
CCL
+$25.7M

Top Sells

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$66M
2
TSLA icon
Tesla
TSLA
+$53.7M
3
GOOG icon
Alphabet (Google) Class C
GOOG
+$38.1M
4
QQQ icon
Invesco QQQ Trust
QQQ
+$37.6M
5
AZO icon
AutoZone
AZO
+$28.5M

Sector Composition

Rank Sector Weight
1 Miscellaneous 97.22%
2 Technology 0.66%
3 Consumer Discretionary 0.49%
4 Healthcare 0.33%
5 Financials 0.3%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
TFIN icon
10001
Triumph Financial Inc
TFIN
$1.66B
– –
-390
Closed -$27.1K
TFX icon
10002
CALL
Teleflex
TFX
$5.86B
– –
-2
Closed -$82K
TGI
10003
DELISTED
Triumph Group
TGI
– –
-4,339
Closed -$64.8K
TGS icon
10004
Transportadora de Gas del Sur
TGS
$4.37B
$0 ﹤0.01%
100
– –
TGT icon
10005
CALL
Target
TGT
$74.7B
– –
-2,811
Closed -$49.6M
TGT icon
10006
Target
TGT
$74.7B
$0 ﹤0.01%
+3,515
New +$658K
TGT icon
10007
PUT
Target
TGT
$74.7B
– –
-3,533
Closed -$62.4M
TGTX icon
10008
CALL
TG Therapeutics
TGTX
$8.57B
– –
-560
Closed -$2.91M
TGTX icon
10009
TG Therapeutics
TGTX
$8.57B
$0 ﹤0.01%
8,204
-872
-10% -$41.9K
TGTX icon
10010
PUT
TG Therapeutics
TGTX
$8.57B
– –
-1,104
Closed -$5.74M
THC icon
10011
CALL
Tenet Healthcare
THC
$21.3B
– –
-309
Closed -$1.23M
THC icon
10012
PUT
Tenet Healthcare
THC
$21.3B
– –
-188
Closed -$750K
THG icon
10013
CALL
Hanover Insurance
THG
$7.95B
– –
-15
Closed -$175K
THG icon
10014
Hanover Insurance
THG
$7.95B
– –
-200
Closed -$23K
TIMB icon
10015
TIM SA
TIMB
$8.76B
– –
-6,353
Closed -$77.8K
TITN icon
10016
Titan Machinery
TITN
$617M
– –
-13,941
Closed -$336K
TKC icon
10017
CALL
Turkcell
TKC
$4.44B
– –
-11
Closed -$5K
TKC icon
10018
Turkcell
TKC
$4.44B
$0 ﹤0.01%
+2,172
New +$12K
TKC icon
10019
PUT
Turkcell
TKC
$4.44B
– –
-2
Closed -$1K
TLT icon
10020
iShares 20+ Year Treasury Bond ETF
TLT
$47.1B
– –
-200
Closed -$31K
TLYS icon
10021
CALL
Tilly's
TLYS
$135M
– –
-321
Closed -$261K
TLYS icon
10022
PUT
Tilly's
TLYS
$135M
– –
-59
Closed -$48K
TMF icon
10023
Direxion Daily 20+ Year Treasury Bull 3X ETF
TMF
$2.16B
– –
-1,500
Closed -$527K
TMUS icon
10024
CALL
T-Mobile US
TMUS
$195B
– –
-1,272
Closed -$17.2M
TMUS icon
10025
T-Mobile US
TMUS
$195B
$0 ﹤0.01%
9,807
+9,707
+9,707% +$1.22M
399 400
401
402 403

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Simplex Trading's Q1 2021 Portfolio in Review

As of Q1 2021, Simplex Trading held 10,706 positions worth $55.7B, down 28% from $77.2B the previous quarter. Its ten largest holdings account for 43% of the portfolio.

Simplex Trading's Q1 2021 filing shows 2,255 new, 3,360 increased, 3,150 reduced and 1,707 closed positions. Its largest new stake was Pfizer: 464,628 shares worth $16.8M. The largest sale was Amazon, an estimated $66M.

By sector, the portfolio is most concentrated in Miscellaneous at 97% of assets, down from 98% a quarter earlier, followed by Technology and Consumer Discretionary.

  • Simplex Trading's largest Q1 2021 buy was Pfizer: 464,628 shares worth $16.8M.
  • Simplex Trading added most to iShares Russell 2000 ETF in Q1 2021, an estimated $67.5M increase.
  • Simplex Trading's biggest Q1 2021 reduction was Amazon, cutting an estimated $66M.
  • Simplex Trading fully exited Alphabet (Google) Class C in Q1 2021, selling an estimated $38.1M.
  • Simplex Trading's ten largest holdings make up 43% of its $55.7B portfolio in Q1 2021.
  • Simplex Trading opened 2,255 new positions and closed 1,707 in Q1 2021.
  • Simplex Trading's portfolio value fell 28% quarter-over-quarter to $55.7B.

Based on Simplex Trading's 13F filing for Q1 2021, filed 26 Apr 2021.